Perhaps a little background… DAS stood for Distribution & Auto Service. "Distribution & Auto Service, Inc. provides vehicle processing, logistics, & marine services to the automotive industry. The company was founded in 1969 & is based in Wilmington, California. DAS was formerly operated as a subsidiary of Nissan North America. On April 30, 2005 Distribution & Auto Service, Inc. became a part of Wallenius Wilhelmsen Logistics. Distribution & Auto Service, Inc. prepped the Datsuns prior to sending them off to the dealers. The older car carriers (before Nissan had its own fleet) always had an 'acceptable' amount of loss/damage when shipping the cars from Japan. DAS, in addition to just unloading the cars and reloading them on American distribution carriers (trucks, trains and other ships), also checked for contact damage (which also took place during the loading/unloading procedure as well) & salt water damage which took place while the vehicles spent weeks in the holds of these ships. The vehicles were washed & checked to make sure that there was no interior damage and that things like the wheel covers, jack & tools, antenna, spare tire, and optional parts were in the car meaning ready for dealer distribution. DAS was primarily a distribution logistics facility however they did have the capability to perform repairs and assembly functions. What the dealer did was PDI (pre-delivery inspection) which would include waxing, installing the wheel covers, antenna, etc. removing plastic from the interior, etc. My concern with your question, Gordon, is that the A/C is not described on your window sticker. It should be. What might be a likely explanation is that the A/C was dealer installed as an option after the sale. That's entirely possible.